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17
SIMPL – A Framework for Accessing External Data
- in Simulation Workflows,” In: Proceedings of the 14th BTW 2011, LNI
, 2011
"... Abstract: Adequate data management and data provisioning are among the most important topics to cope with the information explosion intrinsically associated with simulation applications. Today, data exchange with and between simulation applications is mainly accomplished in a file-style manner. Thes ..."
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Abstract: Adequate data management and data provisioning are among the most important topics to cope with the information explosion intrinsically associated with simulation applications. Today, data exchange with and between simulation applications is mainly accomplished in a file-style manner. These files show proprietary formats and have to be transformed according to the specific needs of simulation applications. Lots of effort has to be spent to find appropriate data sources and to specify and implement data transformations. In this paper, we present SIMPL – an extensible framework that provides a generic and consolidated abstraction for data management and data provisioning in simulation workflows. We introduce extensions to workflow languages and show how they are used to model the data provisioning for simulation workflows based on data management patterns. Furthermore, we show how the framework supports a uniform access to arbitrary external data in such workflows. This removes the burden from engineers and scientists to specify low-level details of data management for their simulation applications and thus boosts their productivity. 1
Ad hoc Iteration and Re-execution of Activities in Workflows
, 2012
"... The repeated execution of workflow logic is usually modeled with loop constructs in the workflow model. But there are cases where it is not known at design time that a subset of activities has to be rerun during workflow execution. For instance in e-Science, scientists might have to spontaneously ..."
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The repeated execution of workflow logic is usually modeled with loop constructs in the workflow model. But there are cases where it is not known at design time that a subset of activities has to be rerun during workflow execution. For instance in e-Science, scientists might have to spontaneously repeat a part of an experiment modeled and executed as workflow in order to gain meaningful results. In general, a manually triggered ad hoc rerun enables users reacting to unforeseen problems and thus improves workflow robustness. It allows natural scientists steering the convergence of scientific results, business analysts controlling their analyses results, and it facilitates an explorative workflow development as required in scientific workflows. In this paper, two operations are formalized for a manually enforced repeated enactment of activities, the iteration and the re-execution. The focus thereby lies on an arbitrary, user-selected activity as a starting point of the rerun. Important topics discussed in this context are handling of data, rerun of activities in activity sequences as well as in parallel and alternative branches, implications on the communication with partners/services and the application of the concept to workflow languages with hierarchically nested activities. Since the operations are defined on a meta-model level, they can be implemented for different workflow languages and engines.
Views on Scientific Workflows
, 2011
"... Workflows are becoming more and more important in e-Science due to the support they provide to scientists in computer simulations, experiments and calculations. Our experiences with workflows in this field and the literature show that scientific workflows consist of a large number of related inform ..."
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Workflows are becoming more and more important in e-Science due to the support they provide to scientists in computer simulations, experiments and calculations. Our experiences with workflows in this field and the literature show that scientific workflows consist of a large number of related information. This information is difficult to deal with in a single perspective and has changing importance to scientists in the different workflow lifecycle phases. In this paper we apply viewing techniques known from business process management to (service-based) scientific workflows to address these issues. We describe seven of the most relevant views and point out realization challenges. We argue that the selected views facilitate the handling of workflows to scientists and add further value to scientific workflow systems. An implementation of a subset of the views based on Web services and BPEL shows the feasibility of the approach. The presented work has the goal to increase additionally the acceptance of the workflow technology in e-Science.
Web Service Composition Reuse through Shared Process Fragment Libraries
- In Web Engineering(ICWE), volume 7387 of LNCS
, 2012
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Enabling coupled multi-scale, multi-field experiments through choreographies of data-driven scientific simulations
, 2014
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A Life Cycle for Coupled Multi-Scale, Multi-Field Experiments Realized through Choreographies
- IN: PROCEEDINGS OF EDOC’14
, 2014
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Service Selection for On-demand Provisioned Services
"... © 2014 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other w ..."
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© 2014 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Decision Support for the Migration of the Application Database Layer to the Cloud
"... © 2013 IEEE Computer Society. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of thi ..."
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© 2013 IEEE Computer Society. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Coupling of Existing Simulations using Bottom-up Modeling of Choreographies
, 2014
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Six Strategies for Building High Performance SOA Applications
"... Abstract. The service-oriented architecture (SOA) concepts such as loose coupling may have negative impact on the overall execution performance of a single request. There are ways to facilitate high performance applications which benefit from this kind of architectural style compensating the caused ..."
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Abstract. The service-oriented architecture (SOA) concepts such as loose coupling may have negative impact on the overall execution performance of a single request. There are ways to facilitate high performance applications which benefit from this kind of architectural style compensating the caused overhead significantly. This paper gives an overview on six high level strategies to improve the performance of SOAs with a central service bus and presents how to apply them to build high performance service-oriented applications without corrupting the SOA paradigm and concepts on the technical level.
